linux-kernel - Re: [PATCH 1/1] cxl/hdm: Fix potential infinite loop in __cxl_dpa

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Message-ID: <24ee9955-518d-4254-a961-3bf6a2d90840@intel.com>
Date: Mon, 12 Jan 2026 09:03:41 -0700
From: Dave Jiang <dave.jiang@...el.com>
To: Li Ming <ming.li@...omail.com>, dave@...olabs.net,
 jonathan.cameron@...wei.com, alison.schofield@...el.com,
 vishal.l.verma@...el.com, ira.weiny@...el.com, dan.j.williams@...el.com
Cc: linux-cxl@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] cxl/hdm: Fix potential infinite loop in
 __cxl_dpa_reserve()



On 1/12/26 5:05 AM, Li Ming wrote:
> In __cxl_dpa_reserve(), it will check if the new resource range is
> included in one of paritions of the cxl memory device.
> cxlds->nr_paritions is used to represent how many partitions information
> the cxl memory device has. In the loop, if driver cannot find a
> partition including the new resource range, it will be an infinite loop.
> 
> Fixes: be5cbd084027 ("cxl: Kill enum cxl_decoder_mode")
> Signed-off-by: Li Ming <ming.li@...omail.com>

Applied to cxl/fixes with Fixes tag fixed
d4026a44626490dc4eca4dd2c4d0816338fa179b

> ---
>  drivers/cxl/core/hdm.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/cxl/core/hdm.c b/drivers/cxl/core/hdm.c
> index 1c5d2022c87a..a470099a69f1 100644
> --- a/drivers/cxl/core/hdm.c
> +++ b/drivers/cxl/core/hdm.c
> @@ -403,7 +403,7 @@ static int __cxl_dpa_reserve(struct cxl_endpoint_decoder *cxled,
>  	 * is not set.
>  	 */
>  	if (cxled->part < 0)
> -		for (int i = 0; cxlds->nr_partitions; i++)
> +		for (int i = 0; i < cxlds->nr_partitions; i++)
>  			if (resource_contains(&cxlds->part[i].res, res)) {
>  				cxled->part = i;
>  				break;